Question

Did I do it wrong? Can’t get the answer.Mass = 10 kgVelocity = 34.39 m/s

Answer 1

Given:

Height, h = 20 m

Mass of block, m = 10 kg

Velocity, v = 34.29 m/s

Let's find the kinetic energy and the potential energy of the block.

• Kinetic energy.

To find the kinetic energy, apply the formula:

`KE=(1)/(2)mv^2`

Where:

m is the mass = 10 kg

v is the velocity = 34.29 m/s

Input values into the formula:

`\begin{gathered} KE=(1)/(2)*10*34.29^2 \\ \\ KE=5879\text{ J }\approx5880\text{ J} \end{gathered}`

The kinetic energy is 5880 Joules.

• Potential Energy.

To find the potential energy, apply the formula:

`PE=m* g* h`

Where:

m is the mass = 10 kg

g is acceleration due to gravity = 9.8 m/s²

h is the height = 20 m

Input values into the formula and solve:

`\begin{gathered} PE=10*9.8*20 \\ \\ PE=1960\text{ J} \end{gathered}`

Therefore, the potential energy is 1960 Joules.

• Kinetic energy = 5880 J

,

• Potential energy = 1960 J.

ANSWER:

D. None of the above